ASTM A540/A540M-24
(Specification)Standard Specification for Alloy-Steel Bolting for Special Applications
Standard Specification for Alloy-Steel Bolting for Special Applications
ABSTRACT
This specification covers a group of common requirements that shall apply to steel flanges, forged fittings, valves, and parts for piping applications under any of the following individual product specifications. This specification covers regular and special-quality alloy steel bolting materials which may be used for nuclear and other special applications. Bolting materials as used in this specification cover rolled or forged bars, rotary pierced or extruded seamless tubes, bored bars, or forged hollows from forged or rolled bar segments to be manufactured into bolts, studs, washers, and nuts. The steel shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, chromium, nickel, molybdenum, vanadium. Material which is ordered in the liquid-quenched and tempered condition shall be uniformly reheated from a temperature below the cooling transformation range to the proper austenitizing temperature. It shall be quenched in a liquid medium under substantially uniform conditions and then uniformly reheated for tempering. Tensile test, hardness, and impact test shall be measured to conform to the required mechanical properties.
SCOPE
1.1 This specification2 covers regular and special-quality alloy steel bolting materials and bolting components that may be used for nuclear and other special applications. See Specification A962/A962M for the definition of bolting.
1.2 The following referenced common requirements are indispensable for application of this specification: Specification A962/A962M.
1.3 Supplementary requirements of an optional nature are provided for use at the option of the purchaser. These supplementary requirements only apply when specified individually by the purchaser in the purchase order or contract.
1.4 This specification is expressed in both inch-pound units and in SI units; however, unless the purchase order or contract specifies the applicable “M” specification designation (SI units), inch-pound units shall apply.
1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: A540/A540M − 24
Standard Specification for
1
Alloy-Steel Bolting for Special Applications
This standard is issued under the fixed designation A540/A540M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 2. Referenced Documents
2 3
1.1 This specification covers regular and special-quality 2.1 ASTM Standards:
A962/A962M Specification for Common Requirements for
alloy steel bolting materials and bolting components that may
be used for nuclear and other special applications. See Speci- Bolting Intended for Use at Any Temperature from Cryo-
genic to the Creep Range
fication A962/A962M for the definition of bolting.
E45 Test Methods for Determining the Inclusion Content of
1.2 The following referenced common requirements are
Steel
indispensable for application of this specification: Specification
A962/A962M.
3. Ordering Information
1.3 Supplementary requirements of an optional nature are
3.1 The inquiry and orders for bolting material and bolting
provided for use at the option of the purchaser. These supple-
components under this specification shall include the
mentary requirements only apply when specified individually
following, as required, to describe the desired items ad-
by the purchaser in the purchase order or contract.
equately:
1.4 This specification is expressed in both inch-pound units
3.1.1 Grade and Class
and in SI units; however, unless the purchase order or contract
3.1.2 Condition (Section 5),
specifies the applicable “M” specification designation (SI
3.1.3 Heat treatment (Section 6),
units), inch-pound units shall apply.
3.1.4 Supplementary Requirements (S1 to S9),
1.5 The values stated in either SI units or inch-pound units
3.1.5 Reports required (Section 16),
are to be regarded separately as standard. Within the text, the
3.1.6 End use, and
SI units are shown in brackets. The values stated in each
3.1.7 Any special requirements.
system may not be exact equivalents; therefore, each system
3.2 The purchaser is referred to the listed supplementary
shall be used independently of the other. Combining values
requirements.
from the two systems may result in non-conformance with the
standard.
4. Common Requirements
1.6 This international standard was developed in accor-
4.1 Bolting materials and bolting components supplied to
dance with internationally recognized principles on standard-
this specification shall conform to the requirements of Speci-
ization established in the Decision on Principles for the
fication A962/A962M. These requirements include test
Development of International Standards, Guides and Recom-
methods, finish, thread dimensions, macro etch, marking,
mendations issued by the World Trade Organization Technical
certification, optional supplementary requirements, and others.
Barriers to Trade (TBT) Committee.
Failure to comply with the requirements of Specification
A962/A962M constitutes nonconformance with this specifica-
tion. In case of conflict between this specification and Speci-
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
fication A962/A962M, this specification shall prevail.
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.22 on Steel Forgings and Wrought Fittings for Piping Applications and Bolting
Materials for Piping and Special Purpose Applications.
Current edition approved March 1, 2024. Published April 2024. Originally
3
approved in 1965. Last previous edition approved in 2021 as A540/A540M – 15 For referenced ASTM standards, visit the ASTM website, www.astm.org, or
(2021). DOI: 10.1520/A0540_A0540M-24. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
2
For ASME Boiler and Pressure Vessel Code Applications see related Specifi- Standards volume information, refer to the standard’s Document Summary page on
cation SA-540 in Section II of that Code. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A540/A540M − 24
5. Manufacture 9. Hardness Requirements
9.1 The hardness shall be determined on the surface of the
5.1 Bolting material shall be supplied hot-rolled or hot-
forged or cold-finished at the option of the producer. However, material after removal of decarburization.
if desired by the purchaser, cold finis
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A540/A540M − 15 (Reapproved 2021) A540/A540M − 24
Standard Specification for
1
Alloy-Steel Bolting for Special Applications
This standard is issued under the fixed designation A540/A540M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
2
1.1 This specification covers regular and special-quality alloy steel bolting materials and bolting components that may be used
for nuclear and other special applications. See Specification A962/A962M for the definition of bolting.
1.2 The following referenced common requirements are indispensable for application of this specification: Specification
A962/A962M.
1.3 Supplementary requirements of an optional nature are provided for use at the option of the purchaser. These supplementary
requirements only apply when specified individually by the purchaser in the purchase order or contract.
1.4 This specification is expressed in both inch-pound units and in SI units; however, unless the purchase order or contract
specifies the applicable “M” specification designation (SI units), inch-pound units shall apply.
1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units
are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used
independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
3
2.1 ASTM Standards:
A962/A962M Specification for Common Requirements for Bolting Intended for Use at Any Temperature from Cryogenic to the
Creep Range
E45 Test Methods for Determining the Inclusion Content of Steel
3. Ordering Information
3.1 The inquiry and orders for bolting material and bolting components under this specification shall include the following, as
required, to describe the desired items adequately:
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.22
on Steel Forgings and Wrought Fittings for Piping Applications and Bolting Materials for Piping and Special Purpose Applications.
Current edition approved Sept. 1, 2021March 1, 2024. Published October 2021April 2024. Originally approved in 1965. Last previous edition approved in 20152021 as
A540/A540M – 15.A540/A540M – 15 (2021). DOI: 10.1520/A0540_A0540M-15R21.10.1520/A0540_A0540M-24.
2
For ASME Boiler and Pressure Vessel Code Applications see related Specification SA-540 in Section II of that Code.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A540/A540M − 24
3.1.1 Grade and Class
3.1.2 Condition (Section 5),
3.1.3 Heat treatment (Section 6),
3.1.4 Supplementary Requirements (S1 to S9),
3.1.5 Reports required (Section 16),
3.1.6 End use, and
3.1.7 Any special requirements.
3.2 The purchaser is referred to the listed supplementary requirements.
4. Common Requirements
4.1 Bolting materials and bolting components supplied to this specification shall conform to the requirements of Specification
A962/A962M. These requirements include test methods, finish, thread dimensions, macro etch, marking, certification, optional
supplementary requirements, and others. Failure to comply with the requirements of Specification A962/A962M constitutes
nonconformance with this specification. In case of conflict between this specification and Specification A962/A962M, this
specification shall prevail.
5. Manufacture
5.1 Bolting material shall be supplied hot-rolled or hot-forged or cold-finished
...
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